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Re: Irregularly Lat Lon Grid: Displaying Land Types [message #41033 is a reply to message #40879]

Thu, 16 September 2004 00:54

Klaus Scipal
Messages: 45
Registered: November 1997

Member

In principle it depends on the grid you use. In global remote sensing for
example, irregular grids are in fact often the product of a sinusoidal
projection, i.e the number of gridpoints decreases with latitude to get
equally sized cells.

Anyway, a quick and dirty way of doing the plotting is to define a
usersymbol which is a filled circle and then use plots with the color
keyword. Color must have the same size as your lon,lat files and it should
contain the colorcodes of the parameter you want to display.

The code might look as follows

a=Findgen(32)*!pi/16.
r=0.1
UserSym,r*cos(a),r*sin(a),/Fill ; define a usersymbol which is a circle and
has the radius r

Plots,lon,lat,Psym=8,Color=color

regards

Klaus

"Thundurstruck" <alonge@atmos.albany.edu> wrote in message
news:fd11a4c5.0409130848.5fbf26c4@posting.google.com...
> Hello all,
>
> I have vegetation type data (Integer 1-13) on a 12km grid and
> would like to display it on a map. I don't want to contour the data
> but rather just display the grid boxes colored according to the
> vegetation class. I can't use map_image (not a regular lat/lon grid).
> Any ideas or suggestions will be greatly appreciated.
>
> Running IDL 5.4 on SGI IRIX

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[Message index]

		Irregularly Lat Lon Grid: Displaying Land Types By: alonge on Mon, 13 September 2004 09:48
		Re: Irregularly Lat Lon Grid: Displaying Land Types By: K. Bowman on Mon, 20 September 2004 12:07
		Re: Irregularly Lat Lon Grid: Displaying Land Types By: Klaus Scipal on Thu, 16 September 2004 00:54

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